Screen structure



April s, 1930. s. a STINE Y 1,753,355

Y l SCREEN STRUCTURE f Filed April 10, 1928 l2 317i@ 25 (9 l 73 M2M/W 12 l2 e mvammwx m C J2 .9 9 8 Z5 J 4 f J/ g. 3f \w M1312@- lz -ZT/ ZB-d L7-a Z3-a 7@ 23g vv E Y l INVEIIITOR v-"atented pr. 8,y 1936 Unire srA'rEs SAMUEL BLAINE sTrNE, or osoEoI/AMiLLs;'PENNSYLVANIA SCREEN sTnUoTUEE Application filed April 10,

My invention relates to screen structures, and more particularly to screens of plate form, such as are employed in connection with the pans f shale crushing mills, for eX- ample, although it may be employed in various other ways. Y

One object of my invention is to provide a screen structure that will have greater life than' those of various forms heretofore emle ployed, by reason of the fact that those portions of the screen which are commonly subjected to greatest Wear are so formed that they will have a life substantially equal to the life of the remaining portions of the l5- screen.

Another object Vofmy invention is to provide a screen structure that is of greater rigidity than the screens of similar sizes, as

'heretofore constructed.

A further object of my invention is to provide means for securing a screen plate to its supporting frame, of such form that the screen plate and its frame will be securely maintained in assembled relation notwithstanding -the wearing-down of the screen plate in use. Y

Still another object ofmy'invention is to simplify and improve generally the structure yand wearing qualities of screen devices.

3eV Some of the forms which my invention may take are shown in the accompanying drawing, wherein Figure l is a view,-par tially in plan and partially in section, of a screen plate and'its supporting frame; Fig. V 2 is a side elevational view of the structure of Fig. l; Fig. 3 is a view taken on the line Ill-III of Fig. l; Fig. l is a view similar to Fig. 3, but showing a modification of the structure of Figs. l to 3.

Referringcto Figs. l to 3, perforated me# tallic screen plates 5 and 6 are welded to the upper edgeof a band or hoop 7. The metallic screen plates 5 and 6 rest upon arframe or Y base 8'. The band 7 is disposed peripherally of the frame 8 and is secured thereto by means of rivets 9.

As shown more clearly in Fig. 2, the screen plate 5 is of greater thickness than the plate 6. The inner portionsvof theL screen platesV employed in connection with crushing mills 192s. serial No. 268,864.

wear much' more rapidly than the outer portions ofsaid plate, with the result that where a single plate of `uniform.thiclniess is em ployed instead of plates 5 and 6,such plate has to be discarded long before the outer portion thereof has become worn out, owing .to

thewearinfrout of the inner portion.v By my arrangement, it is not necessary tok stop crushing and screeningope'rations until after v substantially the yentire. screening surface has become worn down.`V` v f v f' To compensate for` the diiference inthick-v nessl of the plates vandfhl provide offsets in ltheband 7 and the iframe 8, as indicated at 10 in Fig. 2. To Yprovide stllgreater rigidity inthe structure, Weld blocls llA to the undersides of the plates 5.and 6, and provide vcomplementally-formedi recesses in the frame-8,into whichV the: blocks 11 lit.

Counter-sunk or tapering holesA l2 .eXtend through the frame 8, the blocks-11 andthe screen plates 5tandf6, as shown moreclearly i It will be seen that the screen plates and i the frame 8 are rigidly held in assembled relation by means of the band 7 the rivets 9, the blocks V11, and the rivets 13, and that these fastening means are so disposed as to be unaffected by the wearing-clown of the screen e plates in use, so that such screen plates will not become loose upon their frames, even when they have been almost completely worn down. y Referring to Fig. A, a band or band sections 7a are welded to the screen plates'5 and 6 at points removed from the periphery of such plate, so that they will lit against the inner sides of aV frame 8a, instead of against the outer sides thereof, as in Figs. l and 3. The structure'of this modilication'may be otherwise similar to the structuresof Figs. 1 to 3.

It will be understood that the drawing is representative of a segment-like portionpof a with crushing mill pans, and that the other' portions of a complete screen structure may be of the form shown 1n the drawing.

kscreen, such as is employed in connection x lee I claim as my invention l. Screen structure adapted for relative rotative movement With respect to a scraper, comprising an outer screen portion, and an inner screen portion of greater thickness than the outer portion.

2. Screen structure adapted for relative rotative movement With respect to a scraper, comprising an outer screen portion, and an inner screen portion of greater thickness than the outer portion, lthe spacing between the slots of one portion being substantially the same as the spacing of the slots in the other portion.

p 3. Screen structure comprising a frame, a screening plate mounted on said frame7 and a band-like projection depending yfrom the underside" of the plate and abutting against the vertical edges of the frame, the screening' plate entirely overlying the uppermost sur-y faceV of the frame.

4. Screen structure comprising a frame having a hole extending vertically through one side thereof7 a screen Aplate disposed against said sidel of the frame and having a lug extending into said hole, and a rivet-like member extending through the hole and the lug for securing said lug in the said hole.

5. Screen structure comprising a frame having a hole extending through one side thereof, a screen plate disposed against said side of the frame and having a lug extending intosaid hole, and means comprising a rivet extendingthrough a count-ersunk hole in the said lug and through the hole in the vframe for securing the plate to the frame.

YIn testimonywhereof I, thersaid SAMUEL BLrNE STINE, havel hereunto set my hand.

SAMUEL BLAINE STIYE.4 

